Safari put propane generators in a lot of diesel chassis; probably as a cost savings over a diesel generator. Our '95 Safari Trek 6.5 Diesel came with a propane Onan generator. These are usually just gas generators slightly modified to run propane. The power is slightly less, but they are available from Onan. Check their website.
I don't believe Honda makes generators for permanent RV installation, or manufacturers never installed these, so yours may be a "generic" stand-alone model that a previous owner installed. Again, check the Honda generator website for troubleshooting technique, of find a manual for your generator.
Honda Generators: Portable Generator Power for Home, Work, and Play
George Schweikle Lexington, KY
1999 Safari TREK 2830, FMCA 190830, Safari International chapter
1995 Safari TREK 2630, 1983 Winnebago Chieftain, 1976 Midas Mini